D : x = 8 x − 8 x + 1 ≤ 0 ( x + 1 ) ( x − 8 ) ≤ 0 x ∈ ⟨ − 1 , 8 ⟩ x ∈ ⟨ − 1 , 8 ⟩ ∧ x = 8 x ∈ ⟨ − 1 , 8 )
To solve the inequality x − 8 x + 1 ≤ 0 , determine the critical points by setting the numerator and denominator to zero. The solution includes values from − 1 to just below 8 , so x ∈ [ − 1 , 8 ) .
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